A recent survey found that 61​% of all adults over 50 wear glasses for driving. In a random sample of 60 adults over​ 50, what is the mean and standard deviation of those that wear​ glasses? Round the answers to the nearest hundredth.

Q: A food critic wishes to estimate the weights of premium steaks at a five star Texas style…

A: From the provided information, Confidence level = 90% Margin of error (E) = 6 ounces Standard…

Q: A group of data has a mean of 69 with a standard deviation of 5. What is the probability of finding…

A: Given the mean= 69 and standard deviation = 5 So, z score of 61 is:

Q: A sample of 3000 persons were surveyed for their weight in pounds, the mean weight is 135 Ibs with a…

A:

Q: In another company, every worker received a 5% raise. How does this affect the mean salary? The…

A: Every worker received a 5%. The mean defines that the center or average of the data and it is…

Q: A recent poll found that 59% of adults believe the state of moral values is poor. For 400 randomly…

A: Here, n = 400 and p = 0.59

Q: Isn't here the standard deviation equal to 4, not 2, as the tutor wrote?

A: Solution-: Given: μ=-3,σ=4 We want to find, P(0<X<2)=? Draw the picture.

Q: The mean grade on a science test was 79 and there was a standard deviation of 6. If your sister…

A: The z score explains the deviations of the observations from the mean. It is calculated using the…

Q: A successful basketball player has a height of 6 feet 2 ​inches, or 188 cm. Based on statistics from…

A: Given the Z score of height of basket ball player is 1.95. The original height of the basket ball…

Q: The mean monthly rent for apartments in a certain city is $930 with a standard deviation of $350.…

A: Note: Since you have posted multiple independent questions in the same request, we will solve the…

Q: An advertising agency has stated that 20% of all television viewers watch a particular program. How…

A: From the provided information, An advertising agency has stated that 20% of all television viewers…

Q: A sample of 3000 persons were surveyed for their weight in pounds, the mean weight is 135 lbs with a…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: A history class has 95 members. If there is a 22% absentee rate per class meeting , find the mean…

A:

Q: If a distribution has a mean of 50 and a standard deviation of 5, what value would be -1 standard…

A: Given, μ=50σ=5z=-1x=?

Q: Recently, a random sample of 25–34 year olds was asked, "How much do you currently have in savings,…

A: From the different savings class we need to find first the class mid point(xi) . And the frequency…

Q: If each score is increased by 25, what will be the mean and standard deviation of the distribution…

A: Given that  The distribution of raw scores on particular achievement test Mean = 500 Standard…

Q: If on an average 8 ships out of 10 arrive safely at a port, find the mean and standard deviation of…

A:

Q: Students at Arrowhead High School took an English test with a mean of 120 and a standard deviation…

A: Let X be a random variable of normal distribution with mean 120 and standard deviation 25.  Let Z be…

Q: Suppose you are told that a computer programmer in Portugal who makes $809.40 has a z-score of -0.50…

A: Solution: It is given that a computer programmer in Portugal who makes $809.40 has a z-score of…

Q: In 2019, the amount of money that motorists spent on gas had a normal distribution with a mean of…

A: Given Information Number of persons sampled (n) = 2400 Mean (µ) = 900 Standard deviation(σ) = 100…

Q: Students at Roseville High School took an IQ test with a mean of 100 and a standard deviation of 15.…

A: GivenMean(μ)=100standard deviation(σ)=15

Q: The mean life of a battery is 55 hours with a standard deviation of 6 hours. The manufacturer…

A:

Q: Suppose the exam average in a class is 82% with a standard deviation of 2. What proportion of…

A:

Q: Is it possible for the standard deviation of a list of numbers to equal 0? If so, give an example.…

A: Standard deviation refers to the spread in the data set. If the standard deviation equals zero, it…

Q: 95% of 80 night students scored between 70% and 80% on a quiz. If this data is normally distributed,…

A: Given: Total number of students n=80.             let X  denote the marks of students then,  X ~N(µ,…

Q: A test consists of 980 true or false questions. If the student guesses on each question, what is the…

A: Given :  n = 980 Since the questions are true or false type questions, there will be only two…

Q: A livestock company reports that the mean weight of a group of young steers is 1150 pounds with a…

A: μ=1150σ=87  =P1050<x<1250

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: Adult women in the U.S. have a mean height of 64.3", with a standard deviation of 2.58 inches.…

A:

Q: The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances…

A:

Q: The mean life of a battery is 50 hours with a standard deviation of 6 hours. The manufacturer…

A:

Q: In a recent survey, 80% of the community favored building a police substation in their neighborhood.…

A:

Q: An mechanic wishes to determine the length of the typical battery cable. If he knows that the…

A: Given: Standard deviation =3.7 E=0.30 95% confidence interval =1.96 Determine the number of cables…

Q: What percent of the students received a score below 64, if the mean grade on a test was 70 and the…

A:

Q: How many of the people surveyed will have a weight between 130 and 140lbs?

A: Here the mean weight is 135 lbs with a standard deviation of 5 lbs.   Use normal distribution for…

Q: is 6% is your standard deviation?

A: Given according to question Sample size(N)=? Confidence =95% Margin of error = 5% Now question says…

Q: For a medical study, a researcher wishes to select people in thr middle 75% of the population based…

A: Introduction: Definition: Z-score A Z-score is a numerical measurement that describes a value's…

Q: A livestock company reports that the mean weight of a group of young steers is 1180 pounds with a…

A: GivenMean(μ)=1180standard deviation(σ)=90

Q: The average score of the students of a certain class in a 100-item quiz is 83 with a standard…

A:

Q: Suppose the exam average in a class is 55% with a standard deviation of 4. What proportion of…

A: The random variable score follows normal distribution. The population mean is 55.         The…

Q: A recent survey found that 69% of all adults over 50 wear glasses for driving . In a random sample…

A: From the provided information, 69% of all adults over 50 wear glasses for driving that is p = 0.69…

Q: A history class has 75 members.  If there is a 12% absentee rate per class meeting , find the…

A: Given data  P(absent) = p = 0.12  So q= 1-p = 0.88 Sample size (n)= 75 X = no.  of student absent We…

Q: The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is…

A: Consider X be a random variable which follows normal distribution indicates the number of miles…

Q: The average speed of cars on 495 is 74 mph with a standard deviation of 6. What is the probability…

A: GivenMean(μ)=74standard deviation(σ)=6

Q: Suppose the exam average in a class is 82% with a standard deviation of 6. What proportion of…

A: Here, mean is 82 and standard deviation is 6.

Q: The president of a college wants to determine the mean number of units that college students take…

A: From the given information, the population standard deviation is 2.1 units, the confidence level is…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard…

A: Given that.   X~N( μ , ?^2 )   μ=100     , ?=15   Z-score =( x - μ )/?

Q: Would it be reasonable to use the standard deviation formula?

A: here  According to a gallup survey of boys 77% of boys had played computer games in the past week…

Q: The scores for all high school seniors taking the verbal section of the Scholastic Aptitude Test…

A: Given distribution is bell shaped. In bell shaped distribution mean, median and mode are equal.…

Q: Students at Roseville High School took an IQ test with a mean of 100 and a standard deviation of 15.…

A: As per our guidelines we are suppose to answer only one question1)GivenMean(μ)=100standard…